For my browser-based MMORPG I kept running into the same problem: I needed a fast, no-fuss way to pack individual sprites into spritesheets. Aseprite is great software but costs money and most other tools I tried either required installation, had steep learning curves or were clearly built for a different workflow than mine.

So I built my own tool: Spritesheet Generator.

It runs entirely in the browser, nothing to install. You drag in your sprite images, configure your layout, and export a packed spritesheet. That is the whole flow.

What it does:

• Combines multiple images into a single spritesheet
• Configurable grid layout and spacing
• Exports as a ready-to-use image
• Free to use, no account needed
• Export to popular engine formats like Phaser, Unity, Godot and more.

You can try it here: https://spritesheetgenerator.online

It started as a personal tool for my own project, but if it is useful to others in this community, great. If you run into something it cannot do or a feature that would make it fit your workflow better, let me know in the replies. I am actively using it myself so I have a reason to keep improving it and adding features costs you nothing.